Abstract
Searches for fermionic top partners at the TeV scale will bring forward a new final state kinematic regime and event topologies, where Run I search strategies will inevitably fail. We propose concrete search strategies for singly produced charge 2/3 fermionic top partners (T ′) adequate for LHC Run II. Our analysis spans over all of the T′ decay modes (i.e. tZ, th and Wb) where we present detailed discussion of the search performances, signal efficiencies and backgrounds rates. Our LHC Run II search proposals utilize signatures with large missing energy and leptons, as well as jet substructure observables for tagging of boosted heavy SM states, customized b-tagging tactics and forward jet tagging. We analyze the prospects for discovery and exclusion of T ′ models within the framework of partially composite quarks at the LHC Run II. Our results show that the LHC Run II has good prospects for observing T ′ models which predict single production cross section of σ T ′ ∼ 70 − 140 (30 − 65) fb for M T ′ = 1 (1.5) TeV respectively with 100 fb−1 of integrated luminosity, depending on the branching ratios of the T ′. Similarly, we find that cross sections of σ T ′ ∼ 27 − 60 (13 − 24) fb for M T ′ = 1 (1.5) TeV respectively can be excluded with the same amount of data. Our results are minimally model dependent and can be applied to most T ′ models where Γ T ′ ≪ M T ′ .
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Z. Chacko, H.-S. Goh and R. Harnik, The twin Higgs: natural electroweak breaking from mirror symmetry, Phys. Rev. Lett. 96 (2006) 231802 [hep-ph/0506256] [INSPIRE].
N. Craig, S. Knapen and P. Longhi, Neutral naturalness from orbifold Higgs models, Phys. Rev. Lett. 114 (2015) 061803 [arXiv:1410.6808] [INSPIRE].
M. Geller and O. Telem, Holographic twin Higgs model, Phys. Rev. Lett. 114 (2015) 191801 [arXiv:1411.2974] [INSPIRE].
G. Burdman, Z. Chacko, R. Harnik, L. de Lima and C.B. Verhaaren, Colorless top partners, a 125 GeV Higgs and the limits on naturalness, Phys. Rev. D 91 (2015) 055007 [arXiv:1411.3310] [INSPIRE].
N. Craig, S. Knapen and P. Longhi, The orbifold Higgs, JHEP 03 (2015) 106 [arXiv:1411.7393] [INSPIRE].
N. Craig, A. Katz, M. Strassler and R. Sundrum, Naturalness in the dark at the LHC, JHEP 07 (2015) 105 [arXiv:1501.05310] [INSPIRE].
R. Barbieri, D. Greco, R. Rattazzi and A. Wulzer, The composite twin Higgs scenario, JHEP 08 (2015) 161 [arXiv:1501.07803] [INSPIRE].
M. Low, A. Tesi and L.-T. Wang, Twin Higgs mechanism and a composite Higgs boson, Phys. Rev. D 91 (2015) 095012 [arXiv:1501.07890] [INSPIRE].
ATLAS collaboration, Summary of the searches for squarks and gluinos using \( \sqrt{s}=8 \) TeV pp collisions with the ATLAS experiment at the LHC, JHEP 10 (2015) 054 [arXiv:1507.05525] [INSPIRE].
C. Grojean, O. Matsedonskyi and G. Panico, Light top partners and precision physics, JHEP 10 (2013) 160 [arXiv:1306.4655] [INSPIRE].
M. Ciuchini, E. Franco, S. Mishima and L. Silvestrini, Electroweak precision observables, new physics and the nature of a 126 GeV Higgs boson, JHEP 08 (2013) 106 [arXiv:1306.4644] [INSPIRE].
ATLAS collaboration, Search for pair and single production of new heavy quarks that decay to a Z boson and a third generation quark in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, ATLAS-CONF-2014-036, CERN, Geneva Switzerland (2014).
ATLAS collaboration, Search for pair and single production of new heavy quarks that decay to a Z boson and a third-generation quark in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 11 (2014) 104 [arXiv:1409.5500] [INSPIRE].
ATLAS collaboration, Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 08 (2015) 105 [arXiv:1505.04306] [INSPIRE].
ATLAS collaboration, Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 10 (2015) 150 [arXiv:1504.04605] [INSPIRE].
CMS collaboration, Inclusive search for a vector-like T quark with charge 2/3 in pp collisions at \( \sqrt{s}=8 \) TeV, Phys. Lett. B 729 (2014) 149 [arXiv:1311.7667] [INSPIRE].
CMS collaboration, Search for vector-like T quarks decaying to top quarks and Higgs bosons in the all-hadronic channel using jet substructure, JHEP 06 (2015) 080 [arXiv:1503.01952] [INSPIRE].
CMS collaboration, Search for vector-like top quark partners produced in association with Higgs bosons in the diphoton final state, CMS-PAS-B2G-14-003, CERN, Geneva Switzerland (2014).
CMS collaboration, Search for pair-produced vector-like top quark partners decaying to bW in the fully hadronic channel using jet substructure at 8 TeV, CMS-PAS-B2G-12-013, CERN, Geneva Switzerland (2012).
CMS collaboration, Search for vector-like quarks in final states with a single lepton and jets in pp collisions at \( \sqrt{s}=8 \) TeV, CMS-PAS-B2G-12-017, CERN, Geneva Switzerland (2012).
J.A. Aguilar-Saavedra, Identifying top partners at LHC, JHEP 11 (2009) 030 [arXiv:0907.3155] [INSPIRE].
A. De Simone, O. Matsedonskyi, R. Rattazzi and A. Wulzer, A first top partner hunter’s guide, JHEP 04 (2013) 004 [arXiv:1211.5663] [INSPIRE].
A. Azatov, M. Salvarezza, M. Son and M. Spannowsky, Boosting top partner searches in composite Higgs models, Phys. Rev. D 89 (2014) 075001 [arXiv:1308.6601] [INSPIRE].
M. Backović, T. Flacke, S.J. Lee and G. Perez, LHC top partner searches beyond the 2 TeV mass region, JHEP 09 (2015) 022 [arXiv:1409.0409] [INSPIRE].
O. Matsedonskyi, G. Panico and A. Wulzer, On the interpretation of top partners searches, JHEP 12 (2014) 097 [arXiv:1409.0100] [INSPIRE].
M. Backović, T. Flacke, J.H. Kim and S.J. Lee, Discovering heavy new physics in boosted Z channels: Z → ℓ + ℓ − vs Z → \( \nu \overline{\nu} \), Phys. Rev. D 92 (2015) 011701 [arXiv:1501.07456] [INSPIRE].
N. Vignaroli, Discovering the composite Higgs through the decay of a heavy fermion, JHEP 07 (2012) 158 [arXiv:1204.0468] [INSPIRE].
N. Vignaroli, Early discovery of top partners and test of the Higgs nature, Phys. Rev. D 86 (2012) 075017 [arXiv:1207.0830] [INSPIRE].
J. Reuter and M. Tonini, Top partner discovery in the T → tZ channel at the LHC, JHEP 01 (2015) 088 [arXiv:1409.6962] [INSPIRE].
S. Gopalakrishna, T. Mandal, S. Mitra and G. Moreau, LHC signatures of warped-space vectorlike quarks, JHEP 08 (2014) 079 [arXiv:1306.2656] [INSPIRE].
CMS collaboration, Measurement of the single-top-quark t-channel cross section in pp collisions at \( \sqrt{s}=7 \) TeV, JHEP 12 (2012) 035 [arXiv:1209.4533] [INSPIRE].
G. Cacciapaglia, A. Deandrea, N. Gaur, D. Harada, Y. Okada and L. Panizzi, Interplay of vector-like top partner multiplets in a realistic mixing set-up, JHEP 09 (2015) 012 [arXiv:1502.00370] [INSPIRE].
K. Agashe, R. Contino and A. Pomarol, The minimal composite Higgs model, Nucl. Phys. B 719 (2005) 165 [hep-ph/0412089] [INSPIRE].
R. Contino, L. Da Rold and A. Pomarol, Light custodians in natural composite Higgs models, Phys. Rev. D 75 (2007) 055014 [hep-ph/0612048] [INSPIRE].
G.F. Giudice, C. Grojean, A. Pomarol and R. Rattazzi, The strongly-interacting light Higgs, JHEP 06 (2007) 045 [hep-ph/0703164] [INSPIRE].
O. Matsedonskyi, G. Panico and A. Wulzer, Light top partners for a light composite Higgs, JHEP 01 (2013) 164 [arXiv:1204.6333] [INSPIRE].
N. Arkani-Hamed, A.G. Cohen, E. Katz, A.E. Nelson, T. Gregoire and J.G. Wacker, The minimal moose for a little Higgs, JHEP 08 (2002) 021 [hep-ph/0206020] [INSPIRE].
N. Arkani-Hamed, A.G. Cohen, E. Katz and A.E. Nelson, The littlest Higgs, JHEP 07 (2002) 034 [hep-ph/0206021] [INSPIRE].
I. Antoniadis, A possible new dimension at a few TeV, Phys. Lett. B 246 (1990) 377 [INSPIRE].
I. Antoniadis, K. Benakli and M. Quirós, Finite Higgs mass without supersymmetry, New J. Phys. 3 (2001) 20 [hep-th/0108005] [INSPIRE].
C. Csáki, C. Grojean, J. Hubisz, Y. Shirman and J. Terning, Fermions on an interval: quark and lepton masses without a Higgs, Phys. Rev. D 70 (2004) 015012 [hep-ph/0310355] [INSPIRE].
Y. Hosotani, S. Noda and K. Takenaga, Dynamical gauge-Higgs unification in the electroweak theory, Phys. Lett. B 607 (2005) 276 [hep-ph/0410193] [INSPIRE].
D. Choudhury, T.M.P. Tait and C.E.M. Wagner, Beautiful mirrors and precision electroweak data, Phys. Rev. D 65 (2002) 053002 [hep-ph/0109097] [INSPIRE].
G. Panico, E. Ponton, J. Santiago and M. Serone, Dark matter and electroweak symmetry breaking in models with warped extra dimensions, Phys. Rev. D 77 (2008) 115012 [arXiv:0801.1645] [INSPIRE].
K. Agashe, R. Contino, L. Da Rold and A. Pomarol, A custodial symmetry for \( Zb\overline{b} \), Phys. Lett. B 641 (2006) 62 [hep-ph/0605341] [INSPIRE].
R.S. Chivukula, R. Foadi and E.H. Simmons, Patterns of custodial isospin violation from a composite top, Phys. Rev. D 84 (2011) 035026 [arXiv:1105.5437] [INSPIRE].
F. del Aguila, M. Pérez-Victoria and J. Santiago, Observable contributions of new exotic quarks to quark mixing, JHEP 09 (2000) 011 [hep-ph/0007316] [INSPIRE].
G. Cacciapaglia, A. Deandrea, D. Harada and Y. Okada, Bounds and decays of new heavy vector-like top partners, JHEP 11 (2010) 159 [arXiv:1007.2933] [INSPIRE].
Y. Okada and L. Panizzi, LHC signatures of vector-like quarks, Adv. High Energy Phys. 2013 (2013) 364936 [arXiv:1207.5607] [INSPIRE].
M. Buchkremer, G. Cacciapaglia, A. Deandrea and L. Panizzi, Model independent framework for searches of top partners, Nucl. Phys. B 876 (2013) 376 [arXiv:1305.4172] [INSPIRE].
D. Pappadopulo, A. Thamm, R. Torre and A. Wulzer, Heavy vector triplets: bridging theory and data, JHEP 09 (2014) 060 [arXiv:1402.4431] [INSPIRE].
J.A. Aguilar-Saavedra, R. Benbrik, S. Heinemeyer and M. Pérez-Victoria, Handbook of vectorlike quarks: mixing and single production, Phys. Rev. D 88 (2013) 094010 [arXiv:1306.0572] [INSPIRE].
G. Cacciapaglia, H. Cai, T. Flacke, S.J. Lee, A. Parolini and H. Serôdio, Anarchic Yukawas and top partial compositeness: the flavour of a successful marriage, JHEP 06 (2015) 085 [arXiv:1501.03818] [INSPIRE].
LHC Higgs Cross section Working Group collaboration, J.R. Andersen et al., Handbook of LHC Higgs cross sections: 3. Higgs properties, arXiv:1307.1347 [INSPIRE].
L. Basso and J. Andrea, Discovery potential for T ′ → tZ in the trilepton channel at the LHC, JHEP 02 (2015) 032 [arXiv:1411.7587] [INSPIRE].
N.G. Ortiz, J. Ferrando, D. Kar and M. Spannowsky, Reconstructing singly produced top partners in decays to Wb, Phys. Rev. D 90 (2014) 075009 [arXiv:1403.7490] [INSPIRE].
J. Li, D. Liu and J. Shu, Towards the fate of natural composite Higgs model through single t ′ search at the 8 TeV LHC, JHEP 11 (2013) 047 [arXiv:1306.5841] [INSPIRE].
CMS collaboration, Search for top-Higgs resonances in all-hadronic final states using jet substructure methods, CMS-PAS-B2G-14-002, CERN, Geneva Switzerland (2014).
M. Backović, T. Flacke, J.H. Kim and S.J. Lee, Boosted event topologies from TeV scale light quark composite partners, JHEP 04 (2015) 082 [arXiv:1410.8131] [INSPIRE].
F. Maltoni and T. Stelzer, MadEvent: automatic event generation with MadGraph, JHEP 02 (2003) 027 [hep-ph/0208156] [INSPIRE].
R.D. Ball et al., Parton distributions with LHC data, Nucl. Phys. B 867 (2013) 244 [arXiv:1207.1303] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].
M.L. Mangano, M. Moretti, F. Piccinini and M. Treccani, Matching matrix elements and shower evolution for top-quark production in hadronic collisions, JHEP 01 (2007) 013 [hep-ph/0611129] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, FastJet user manual, Eur. Phys. J. C 72 (2012) 1896 [arXiv:1111.6097] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, The anti-k t jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [INSPIRE].
J.M. Butterworth, A.R. Davison, M. Rubin and G.P. Salam, Jet substructure as a new Higgs search channel at the LHC, Phys. Rev. Lett. 100 (2008) 242001 [arXiv:0802.2470] [INSPIRE].
L.G. Almeida, O. Erdogan, J. Juknevich, S.J. Lee, G. Perez and G. Sterman, Three-particle templates for a boosted Higgs boson, Phys. Rev. D 85 (2012) 114046 [arXiv:1112.1957] [INSPIRE].
M. Backovic, J. Juknevich and G. Perez, Boosting the standard model Higgs signal with the template overlap method, JHEP 07 (2013) 114 [arXiv:1212.2977] [INSPIRE].
M. Schlaffer, M. Spannowsky, M. Takeuchi, A. Weiler and C. Wymant, Boosted Higgs shapes, Eur. Phys. J. C 74 (2014) 3120 [arXiv:1405.4295] [INSPIRE].
S.D. Ellis, J. Huston, K. Hatakeyama, P. Loch and M. Tonnesmann, Jets in hadron-hadron collisions, Prog. Part. Nucl. Phys. 60 (2008) 484 [arXiv:0712.2447] [INSPIRE].
A. Abdesselam et al., Boosted objects: a probe of beyond the standard model physics, Eur. Phys. J. C 71 (2011) 1661 [arXiv:1012.5412] [INSPIRE].
G.P. Salam, Towards jetography, Eur. Phys. J. C 67 (2010) 637 [arXiv:0906.1833] [INSPIRE].
P. Nath et al., The hunt for new physics at the Large Hadron Collider, Nucl. Phys. Proc. Suppl. 200-202 (2010) 185 [arXiv:1001.2693] [INSPIRE].
L.G. Almeida, R. Alon and M. Spannowsky, Structure of fat jets at the Tevatron and beyond, Eur. Phys. J. C 72 (2012) 2113 [arXiv:1110.3684] [INSPIRE].
T. Plehn and M. Spannowsky, Top tagging, J. Phys. G 39 (2012) 083001 [arXiv:1112.4441] [INSPIRE].
A. Altheimer et al., Jet substructure at the Tevatron and LHC: new results, new tools, new benchmarks, J. Phys. G 39 (2012) 063001 [arXiv:1201.0008] [INSPIRE].
D.E. Soper and M. Spannowsky, Finding physics signals with shower deconstruction, Phys. Rev. D 84 (2011) 074002 [arXiv:1102.3480] [INSPIRE].
D.E. Soper and M. Spannowsky, Finding top quarks with shower deconstruction, Phys. Rev. D 87 (2013) 054012 [arXiv:1211.3140] [INSPIRE].
M. Jankowiak and A.J. Larkoski, Jet substructure without trees, JHEP 06 (2011) 057 [arXiv:1104.1646] [INSPIRE].
D. Krohn, J. Thaler and L.-T. Wang, Jet trimming, JHEP 02 (2010) 084 [arXiv:0912.1342] [INSPIRE].
S.D. Ellis, C.K. Vermilion and J.R. Walsh, Recombination algorithms and jet substructure: pruning as a tool for heavy particle searches, Phys. Rev. D 81 (2010) 094023 [arXiv:0912.0033] [INSPIRE].
M. Backović and J. Juknevich, TemplateTagger v1.0.0: a template matching tool for jet substructure, Comput. Phys. Commun. 185 (2014) 1322 [arXiv:1212.2978] [INSPIRE].
M. Backovic, O. Gabizon, J. Juknevich, G. Perez and Y. Soreq, Measuring boosted tops in semi-leptonic \( t\overline{t} \) events for the standard model and beyond, JHEP 04 (2014) 176 [arXiv:1311.2962] [INSPIRE].
A. Hook, M. Jankowiak and J.G. Wacker, Jet dipolarity: top tagging with color flow, JHEP 04 (2012) 007 [arXiv:1102.1012] [INSPIRE].
J. Thaler and K. Van Tilburg, Identifying boosted objects with N -subjettiness, JHEP 03 (2011) 015 [arXiv:1011.2268] [INSPIRE].
J. Thaler and K. Van Tilburg, Maximizing boosted top identification by minimizing N -subjettiness, JHEP 02 (2012) 093 [arXiv:1108.2701] [INSPIRE].
J. Thaler and L.-T. Wang, Strategies to identify boosted tops, JHEP 07 (2008) 092 [arXiv:0806.0023] [INSPIRE].
L.G. Almeida, S.J. Lee, G. Perez, G.F. Sterman, I. Sung and J. Virzi, Substructure of high-p T jets at the LHC, Phys. Rev. D 79 (2009) 074017 [arXiv:0807.0234] [INSPIRE].
L.G. Almeida, S.J. Lee, G. Perez, G. Sterman and I. Sung, Template overlap method for massive jets, Phys. Rev. D 82 (2010) 054034 [arXiv:1006.2035] [INSPIRE].
V. Rentala, W. Shepherd and T.M.P. Tait, Tagging boosted W s with wavelets, JHEP 08 (2014) 042 [arXiv:1404.1929] [INSPIRE].
J. Cogan, M. Kagan, E. Strauss and A. Schwarztman, Jet-images: computer vision inspired techniques for jet tagging, JHEP 02 (2015) 118 [arXiv:1407.5675] [INSPIRE].
A.J. Larkoski, S. Marzani, G. Soyez and J. Thaler, Soft drop, JHEP 05 (2014) 146 [arXiv:1402.2657] [INSPIRE].
ATLAS collaboration, b-tagging in dense environments, ATL-PHYS-PUB-2014-014, CERN, Geneva Switzerland (2014).
D.E. Kaplan, K. Rehermann, M.D. Schwartz and B. Tweedie, Top tagging: a method for identifying boosted hadronically decaying top quarks, Phys. Rev. Lett. 101 (2008) 142001 [arXiv:0806.0848] [INSPIRE].
R. Alon, E. Duchovni, G. Perez, A.P. Pranko and P.K. Sinervo, A data-driven method of pile-up correction for the substructure of massive jets, Phys. Rev. D 84 (2011) 114025 [arXiv:1101.3002] [INSPIRE].
ATLAS collaboration, ATLAS measurements of the properties of jets for boosted particle searches, Phys. Rev. D 86 (2012) 072006 [arXiv:1206.5369] [INSPIRE].
CMS collaboration, Determination of jet energy calibration and transverse momentum resolution in CMS, 2011 JINST 6 P11002 [arXiv:1107.4277] [INSPIRE].
M. Cacciari and G.P. Salam, Pileup subtraction using jet areas, Phys. Lett. B 659 (2008) 119 [arXiv:0707.1378] [INSPIRE].
G. Cowan, K. Cranmer, E. Gross and O. Vitells, Asymptotic formulae for likelihood-based tests of new physics, Eur. Phys. J. C 71 (2011) 1554 [Erratum ibid. C 73 (2013) 2501] [arXiv:1007.1727] [INSPIRE].
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1507.06568
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
About this article
Cite this article
Backović, M., Flacke, T., Kim, J.H. et al. Search strategies for TeV scale fermionic top partners with charge 2/3. J. High Energ. Phys. 2016, 14 (2016). https://doi.org/10.1007/JHEP04(2016)014
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP04(2016)014